A Chinese water park has shut down its “tsunami pool” after a machine malfunction created a massive artificial wave that injured dozens of swimmers. Video footage shared on Chinese social network Weibo shows a pool full of people in inflatable floats watching in horror as swimmers are swept atop the giant wave at the Yulong Shuiyun Water Park, in the city of Longjing city near the border with North Korea. A total of 44 people were injured, according to a statement from Longjing officials on Wednesday. Several local agencies, including the city emergency department, the cultural and tourism department, and the market regulators, have launched a joint investigation into the accident, according to the statement. Preliminary findings suggest the cause was damage in the wave machine control room’s power distribution cabinet. The statement also denied claims online that the accident was caused by “a drunken man.” “Leaders of Longjing Municipal Council and city government are highly concerned about this incident,” the statement said. “All the related departments of Longjing City have ordered the company to stop the operation of the tsunami pool.” The park claims to be the largest water park of its kind in Jilin province, boasting a tidal rafting river, Ferris wheel and spa pools, according to its website.